IBIC2012 - List of Keywords (high-voltage)

Paper	Title	Other Keywords	Page
MOPB54	Development of the New Type MLIC with PMMA Plates and Graphite Electrodes	ion, heavy-ion, detector, power-supply	194
	S. Iwata, C. Kobayashi, N.S. Shinozaki, A. Takubo AEC, Chiba, Japan S. Fukuda NIRS, Chiba-shi, Japan T. Kanai Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan
	The MLIC (Multi-Layer Ionization Chamber) that has a lot of ionization chambers stacked in the depth direction is a useful detector for measuring the depth dose distribution (DDD). By using the MLIC, the measurement time and the amount of beam for dosimetry are drastically decreased. In HIMAC (Heavy-Ion Medical Accelerator in Chiba), the MLIC has been effectively used for QA (Quality Assurance) measurement of heavy-ion therapeutic beam since 2002. We are developing a new type MLIC that has electrodes made of graphite on the surface of the polymethyl-methacrylate (PMMA) plates for particle therapy. The purpose is to obtain the same results as the DDD in water. We will report on the progress of the development.

TUIC02	Direct Observation of the Dust-trapping Phenomenon	vacuum, electron, ion, experiment	315
	Y. Tanimoto KEK, Ibaraki, Japan
	Dust trapping has long been an unwelcome and mysterious phenomenon in electron storage rings. As it leads to a sudden decrease in beam lifetime, dust trapping has been a perpetual nuisance at the Photon Factory Advanced Ring (PF-AR) since its beginning in the 1980s. However, during recent research on dust trapping at the PF-AR, video cameras serendipitously captured the culprit behind this phenomenon; the cameras recorded a luminous micro-particle trapped in the electron beam, just as if a shooting star were traveling in the beam tube. In the successive research, supersensitive cameras repeatedly observed trapped dust particles, and revealed that they behaved differently under different conditions. My presentation will summarize these experimental results, as well as long-term statistics supporting present dust-trapping theories.
	Slides TUIC02 [8.200 MB]

Paper

Title

Other Keywords

Page

MOPB54

Development of the New Type MLIC with PMMA Plates and Graphite Electrodes

ion, heavy-ion, detector, power-supply

194

S. Iwata, C. Kobayashi, N.S. Shinozaki, A. Takubo
AEC, Chiba, Japan
S. Fukuda
NIRS, Chiba-shi, Japan
T. Kanai
Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan

The MLIC (Multi-Layer Ionization Chamber) that has a lot of ionization chambers stacked in the depth direction is a useful detector for measuring the depth dose distribution (DDD). By using the MLIC, the measurement time and the amount of beam for dosimetry are drastically decreased. In HIMAC (Heavy-Ion Medical Accelerator in Chiba), the MLIC has been effectively used for QA (Quality Assurance) measurement of heavy-ion therapeutic beam since 2002. We are developing a new type MLIC that has electrodes made of graphite on the surface of the polymethyl-methacrylate (PMMA) plates for particle therapy. The purpose is to obtain the same results as the DDD in water. We will report on the progress of the development.

TUIC02

Direct Observation of the Dust-trapping Phenomenon

vacuum, electron, ion, experiment

315

Y. Tanimoto
KEK, Ibaraki, Japan

Dust trapping has long been an unwelcome and mysterious phenomenon in electron storage rings. As it leads to a sudden decrease in beam lifetime, dust trapping has been a perpetual nuisance at the Photon Factory Advanced Ring (PF-AR) since its beginning in the 1980s. However, during recent research on dust trapping at the PF-AR, video cameras serendipitously captured the culprit behind this phenomenon; the cameras recorded a luminous micro-particle trapped in the electron beam, just as if a shooting star were traveling in the beam tube. In the successive research, supersensitive cameras repeatedly observed trapped dust particles, and revealed that they behaved differently under different conditions. My presentation will summarize these experimental results, as well as long-term statistics supporting present dust-trapping theories.

Slides TUIC02 [8.200 MB]